Control Valve & Pinion

CAUTION: Excessive turning of steering gear will cause damage to pressure gauge.

Connect a 100 psi (7 kg/cm² ) pressure gauge into pump return line. Start engine, and let it idle. Pressure reading should be about 40 psi (2.8 kg/cm² ). Turn steering gear left and right a small amount.
Pressure should increase in equal amounts as wheel is turned in either direction. A slight fall in pressure, occurring before a rise in pressure, indicates a defective control valve. Stop and restart engine.
If system pressure readings were not to specification, connect Shutoff Valve (JD10-2) between pump and pressure gauge. This will isolate steering pump from steering gear and determine if problem is in gear or in pump. See Figure .
CAUTION: DO NOT keep shutoff valve closed for more than 5 seconds at a time, otherwise fluid will overheat, causing possible damage to system.
With shutoff valve open, start engine and allow steering fluid to reach normal operating temperature. Close shutoff valve. Repeat pressure tests.
If pressure is 1100-1200 psi (77-84 kg/cm² ), fault is in steering gear. If pressure is not as specified, fault is in pump. See OVERHAUL .